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Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes

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Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes

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dc.contributor.author	Kim, Y. H.
dc.contributor.author	Kim, S.
dc.contributor.author	Kakekhani, A.
dc.contributor.author	Park, J.
dc.contributor.author	Park, J.
dc.contributor.author	Lee, Y. H.
dc.contributor.author	Xu, H.
dc.contributor.author	Nagane, S.
dc.contributor.author	Wexler, R. B.
dc.contributor.author	Kim, D. H.
dc.contributor.author	Hyeon Jo, S.
dc.contributor.author	Martínez Sarti, Laura
dc.contributor.author	Tan, P.
dc.contributor.author	Sadhanala, A.
dc.contributor.author	Park, G. S.
dc.contributor.author	Kim, Y. W.
dc.contributor.author	Hu, B.
dc.contributor.author	Bolink, Henk
dc.contributor.author	Yoo, S.
dc.contributor.author	Friend, R. H.
dc.contributor.author	Rappe, A. M.
dc.contributor.author	Lee, T.W.
dc.date.accessioned	2021-04-28T09:01:54Z
dc.date.available	2021-04-28T09:01:54Z
dc.date.issued	2021
dc.identifier.citation	Kim, Y. H. Kim, S. Kakekhani, A. Park, J. Park, J. Lee, Y. H. Xu, H. Nagane, S. Wexler, R. B. Kim, D. H. Hyeon Jo, S. Martínez Sarti, Laura Tan, P. Sadhanala, A. Park, G. S. Kim, Y. W. Hu, B. Bolink, Henk Yoo, S. Friend, R. H. Rappe, A. M. Lee, T.W. 2021 Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes Nature Photonics 15 148 155
dc.identifier.uri	https://hdl.handle.net/10550/78955
dc.description.abstract	Electroluminescence efficiencies of metal halide perovskite nanocrystals (PNCs) are limited by a lack of material strategies that can both suppress the formation of defects and enhance the charge carrier confinement. Here we report a one-dopant alloying strategy that generates smaller, monodisperse colloidal particles (confining electrons and holes, and boosting radiative recombination) with fewer surface defects (reducing non-radiative recombination). Doping of guanidinium into formamidinium lead bromide PNCs yields limited bulk solubility while creating an entropy-stabilized phase in the PNCs and leading to smaller PNCs with more carrier confinement. The extra guanidinium segregates to the surface and stabilizes the undercoordinated sites. Furthermore, a surface-stabilizing 1,3,5-tris(bromomethyl)-2,4,6-triethylbenzene was applied as a bromide vacancy healing agent. The result is highly efficient PNC-based light-emitting diodes that have current efficiency of 108 cd A−1 (external quantum efficiency of 23.4%), which rises to 205 cd A−1 (external quantum efficiency of 45.5%) with a hemispherical lens
dc.language.iso	eng
dc.relation.ispartof	Nature Photonics, 2021, vol. 15, p. 148-155
dc.subject	Química
dc.title	Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes
dc.type	journal article	es_ES
dc.date.updated	2021-04-28T09:01:55Z
dc.identifier.doi	10.1038/s41566-020-00732-4
dc.identifier.idgrec	143029
dc.rights.accessRights	open access	es_ES